Examine source code of Beach sand

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Beach party",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 183, 0, 0.5)",
      "toolbar_text": "rgb(0, 108, 255)",
      "frame": "rgb(255, 196, 49)",
      "tab_background_text": "rgb(255, 47, 208)",
      "toolbar_field": "rgb(206, 245, 255)",
      "toolbar_field_text": "rgb(0, 67, 255)",
      "tab_line": "rgb(255, 0, 101)",
      "popup": "rgb(187, 255, 239)",
      "popup_text": "rgb(255, 101, 64)",
      "tab_loading": "rgb(255, 0, 101)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e30f4794-0a92-447e-9c36-939a50e06e20}"
    }
  }
}